diff --git a/redbot/core/core_commands.py b/redbot/core/core_commands.py
index d1d335d10..68098ae17 100644
--- a/redbot/core/core_commands.py
+++ b/redbot/core/core_commands.py
@@ -298,7 +298,9 @@ class Core:
                 await ctx.send("I guess not.")
                 break
             try:
-                msg = int(msg.content)
+                msg = int(msg.content) - 1
+                if msg < 0:
+                    break
                 await self.leave_confirmation(guilds[msg], owner, ctx)
                 break
             except (IndexError, ValueError, AttributeError):